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On the absolute value of the air-fluorescence yield Rosado Vélez, Jaime Blanco Ramos, Francisco Arqueros Martínez, Fernando © Elsevier Science BV 2014. This work was supported by MINECO (FPA2009-07772, FPA2012-39489-C04-02) and CONSOLIDER CPAN CSD2007-42. We thank our colleagues of the Auger Collaboration for fruitful discussions and comments on this work. The absolute value of the air-fluorescence yield is a key parameter for the energy reconstruction of extensive air showers registered by fluorescence telescopes. In previous publications, we reported a detailed Monte Carlo simulation of the air-fluorescence generation that allowed the theoretical evaluation of this parameter. This simulation has been upgraded in the present work. As a result, we determined an updated absolute value of the fluorescence yield of 7.9 +/- 2.0 ph/MeV for the band at 337 nm in dry air at 800 hPa and 293 K, in agreement with experimental values. We have also performed a critical analysis of available absolute measurements of the fluorescence yield with the assistance of our simulation. Corrections have been applied to some measurements to account for a bias in the evaluation of the energy deposition. Possible effects of other experimental aspects have also been discussed. From this analysis, we determined an average fluorescence yield of 7.04 +/- 0.24 ph/MeV at the above conditions. (C) 2014 Elsevier B.V. All rights reserved. 2023-06-19T14:55:32Z 2023-06-19T14:55:32Z 2014-03 journal article 0927-6505 10.1016/j.astropartphys.2014.02.003 https://hdl.handle.net/20.500.14352/34804 http://dx.doi.org/10.1016/j.astropartphys.2014.02.003 http://arxiv.org/abs/1401.4310 http://www.sciencedirect.com/ eng FPA2009-07772 FPA2012-39489-004-02 CSD2007-42 open access Elsevier Science BV